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Simplifying 3(5 + a) = 21 (5 * 3 + a * 3) = 21 (15 + 3a) = 21 Solving 15 + 3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3a = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3a = 21 + -15 3a = 21 + -15 Combine like terms: 21 + -15 = 6 3a = 6 Divide each side by '3'. a = 2 Simplifying a = 2
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